Permanent magnets are made of high carbon steel and

Which of the following is a mineral?

Asbestos cement . . . . . . . .

Refractory bricks resist

The main ingredients of Portland cement are

A good building stone should not absorb water more than

A pug mill is used for

Initial setting of cement is caused due to

The weight of 1 m<sup>3</sup> of brick earth, is about